grassrootseconomics/openethereum
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Performance optimizations (#1642)

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* Optimize ethash verification

* disable WAL for puts

* Clear account cache after commit

* Commit only modified accounts

* Optimize existing block check

* Cache last hashes
This commit is contained in:
Arkadiy Paronyan
2016-07-17 09:18:15 +02:00
committed by Gav Wood
parent 5dba43178b
commit 5ab18d1313
7 changed files with 77 additions and 23 deletions
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12
ethash/src/compute.rs
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@@ -271,11 +271,12 @@ fn hash_compute(light: &Light, full_size: usize, header_hash: &H256, nonce: u64)
let page_size = 4 * MIX_WORDS;
let num_full_pages = (full_size / page_size) as u32;
let cache: &[Node] = &light.cache; // deref once for better performance
for i in 0..(ETHASH_ACCESSES as u32) {
let index = fnv_hash(f_mix.get_unchecked(0).as_words().get_unchecked(0) ^ i, *mix.get_unchecked(0).as_words().get_unchecked((i as usize) % MIX_WORDS)) % num_full_pages;
for n in 0..MIX_NODES {
let tmp_node = calculate_dag_item(index * MIX_NODES as u32 + n as u32, light);
let tmp_node = calculate_dag_item(index * MIX_NODES as u32 + n as u32, cache);
for w in 0..NODE_WORDS {
*mix.get_unchecked_mut(n).as_words_mut().get_unchecked_mut(w) = fnv_hash(*mix.get_unchecked(n).as_words().get_unchecked(w), *tmp_node.as_words().get_unchecked(w));
}
@@ -306,18 +307,17 @@ fn hash_compute(light: &Light, full_size: usize, header_hash: &H256, nonce: u64)
}
}
fn calculate_dag_item(node_index: u32, light: &Light) -> Node {
fn calculate_dag_item(node_index: u32, cache: &[Node]) -> Node {
unsafe {
let num_parent_nodes = light.cache.len();
let cache_nodes = &light.cache;
let init = cache_nodes.get_unchecked(node_index as usize % num_parent_nodes);
let num_parent_nodes = cache.len();
let init = cache.get_unchecked(node_index as usize % num_parent_nodes);
let mut ret = init.clone();
*ret.as_words_mut().get_unchecked_mut(0) ^= node_index;
sha3::sha3_512(ret.bytes.as_mut_ptr(), ret.bytes.len(), ret.bytes.as_ptr(), ret.bytes.len());
for i in 0..ETHASH_DATASET_PARENTS {
let parent_index = fnv_hash(node_index ^ i, *ret.as_words().get_unchecked(i as usize % NODE_WORDS)) % num_parent_nodes as u32;
let parent = cache_nodes.get_unchecked(parent_index as usize);
let parent = cache.get_unchecked(parent_index as usize);
for w in 0..NODE_WORDS {
*ret.as_words_mut().get_unchecked_mut(w) = fnv_hash(*ret.as_words().get_unchecked(w), *parent.as_words().get_unchecked(w));
}